The 1999 Japan Open Tennis Championships women's singles was the women's singles event of the twenty-fifth edition of the Japan Open; a WTA Tier III tournament held in Tokyo, Japan. Ai Sugiyama was the defending champion but lost in the final 6–2, 6–2 against Amy Frazier.
Seeds
Draw
Finals
Top half
Bottom half
Qualifying
Seeds
Qualifiers
Lucky losers Wynne Prakusya
Qualifying draw
First qualifier
Second qualifier
Third qualifier
Fourth qualifier
References